Alloy Mainspring for 19 ligne BFG caliber 611 (new & old), 635

Unmarked Maker Swiss Mainspring for 19 ligne Baumgartner caliber 611 (new & old), 635 pocket watch movements plus perhaps similar ébauche watches, GR Ref. 5620, white alloy, new in tiny envelope. See images for precise mainspring specifications.  I specialize in hard to find watch parts so I usually have whatever you might need and all watch parts are unconditionally guaranteed. Images do a pretty good job of representing the item.